Searching in a user's vault & massive cancellation

1) when i try to search archived email in a user's (user A) vault i got this error message : "Error during the execution of the requested action" (sorry for bad translate) , if i try to search in user B vault the operation work correctly.

if i log on the EVserver from another computer (using the same credential - administrator) the search operation work correctly for both user : A and B

2) is there any method to make massive delete of archived email? or i can only delete sought items? (so the maximus number of item that can be deleted is 50)